Light propagation through a sharp-bend coupled-cavity waveguide in a two-dimensional photonic crystal

N. Malkova, Cun-Zheng Ning

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2 Scopus citations


We investigate light propagation through a coupled-defect waveguide with a 45° sharp bend in a two-dimensional photonic crystal analytically and numerically. The waveguide mode is the degenerate defect state of a square lattice. The transmission through such a structure drops by two orders of magnitude if a 45° bend is introduced. We show that, by properly distorting the lattice around each defect, the splitting of the degenerate defect state allows resonant transmission through the bend, leading to a two orders of magnitude increase in transmission through the bend waveguide. Several applications of such waveguides are discussed including dynamical directional switching and dynamic light trapping and releasing.

Original languageEnglish (US)
Article number155101
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number15
Publication statusPublished - 2006
Externally publishedYes


ASJC Scopus subject areas

  • Condensed Matter Physics

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